Expanding mandrel



sept; 4, 1924s.

S. CUNNINGHAM EXPANDING MANDREL- .Filed Au ..30, 1926 "-.-Mlr-z-. -t,..- .f y

Patented Sept. 4, y1928.

'n letale?l sYLvEsTEn CUNNINGHAM, or EVANSVILLE, INDIANA.-

EXPANDING MANDREL.

Application filed August' 30, 1926. Serial No.. 132,625.

This invention relates to an expanding mandrel for holding the tube or shell on which a handleless broom is to be made.l

My improvements may be embodied in a wholly new chuck, or, they may be adapted to an ordinary chuck which is used for making brooms having handles, for the purposeV of converting such ordinary chuck into an automatic chuck for the purpose set forth.

In converting an ordinary chuck into my improved automatic chuck or mandrel, the housing, the handle, and the grippers or the old chuck are removed and my improved expanding and contracting mandrel is substituted, means being provided ttor holding the springs 'formerly used for operating the grippers.

A practical embodiment oi' the invention is set forth hereinafter and is shown in the accompanying drawings in which:

Figure 1, is a side elevation,\the tube or thimble being indicated in a diagrammaticA manner and the broom which has been formed being shown in dotanddash lines;

Fig. 2, is a longitudinal section, the mandrel being expanded and the tube or thimble being shown in position thereon; p

Fig. 3, is a similar view, the mandrel being contracted and the tube or thimble having been formed with the bead thereon; and

Fig. 4, is an end elevation.

The shaft of the chuck appears at 1 and the housing is shown at 2. 'The springs shown at 3 are those which, prior to the conversion et the device into an automatic mandrel according to my invention, were used to operate the grippers which were employed within the housing 2 for the purpose -oif gripping the handle olthe'broom.

These springs 3 are allowed to remain and are ordinarily used to hold the mandrel 4 ot' my invention, connecting it to the shaft 1. For that purpose, the mandrel 4 is provided with a head or disc 5 which has notches 6 that receive the springs 3, said disc 5 fitting within the end ot' the shaft 1.

The mandrel is provided with a transverse slot 7. Corresponding slots 8 are provided in the housing 2. The slots 7 and 8 accommodate a wedge 9 which, when in the position, shown in Figure 2, permits the expanding mandrel to expand, but when driven into the position shown in Figure 3, causes the mandrel to contract.

The mandrel has a iiXed part lOprovided with a transverse slot 11 to accommodatethe pin 12 which iscarried bythe tube or thimble 13, such being the usual construction of tubes or thimbles lused in the manufactureolf handleless brooms. As originally formed, the tube 13l has a flange 14. i beaded Vor crimped into the `term shown at 14 in vFigures 1 and 3, as will presently appear. g i

The expanding section of the mandrel is shown at 14, being a piece which is mounted to slide longitudinally in a channel or groove 15, in the mandrel and guided by screws 16 kwhich work in slots 17. rlhe expanding section 14 1s operated by a slide 18 which works in an opening 19 in the mandrel 4 and bears on the end of the section 14 and also on the wedge 9. i

W hen the section 14 is driven home as shown in Figure 2, to hold the tube 13, the wedge 9 is in the position shown in Figure W hen the broom has been formed and it is desired to release it from the mandrel, the wedge 9 is driven in, thereby contracting the section 14 as shown in Figure 3.

Slidably mounted on the mandrel 4 is a. beading or crimping collar 2O which is adapted to change the form of the flange 14', Fig. 2, to the term shown at 14, Figs. 1 and` 3. The collar 2O is operated by a handle 21 pivoted at 22 to a member 28 which is fixed to the frame of the machine.

The tube or thimble 18 having been slipped over the mandrelf4, the section 14 is forced inwardly to clamp'the tube on the mandrel. The pin 12 which is carried by trie tube, enters the slot 11. lidfheu the broom is fully wrapped by the wire eniployed for that purpose, the tube 13 is tight on the n'iaudrei and would tend stick were itnot for the pro- 'vision oi the section 14 and the wedge 9. To release the tini shed broom, it is only necessary to tap on the wedge 9 to iioree the section 14 to the position shown in Fig. 3, thereby releasing the broom so that it may be taken olf ot the n'iandrel.

` By operating the handle 21, the bead 14 may be 'formed on the end ol the broom, the latter appearing at 24.

My invention can be made` without employing any parts of the old handle or hold ing chuck but it has great usefulness in being constructed so-that it may be adapted to the old style of chuck by utilizingthe shaft 1,

-housing'2, and springs 3 of said old chuck Such iange is.A

and by'removifng the grippers which, prior to made on present-dayA broom making ma-` chines.

A. WVhat. I claimris:

Y VVA,and a housing cerriedtherehy, of `awnindrel `hoirsinm' and providedWit-h a head, members outside the housing, `and means Carried by the housing andlindependent of hheafloresaid fseoing ineens "for prting @he expanding part of the. mandrel. i

2. In an expandinfr mandrel of the chard* Whse Eddy is received'within the housing I i Y and is i rovdedivith a cross-Slo@ said man- 1. In an expandin inandiel of therhair-vt laster setforth, the combination with a shaft vren yed" wedge Whih is slideble lengthwise "of t3 e mandrel 'and 'adpedjto 'directly enhev slotjin the body of thehianidrelfsadkey 'being` adapted to' cos-,operate 'with the slidable I "SYLVESTR UUNNINGHM 

